New Delhi, June 11 -- The FBI has seized more than a dozen websites that officials say were part of a Chinese effort to target American workers who have access to classified or sensitive government information, the Justice Department said Wednesday.

The 13 websites purported to be affiliated with consulting companies that advertised job openings for current and former holders of security clearances. But the companies were all fakes and the job postings were a sham, officials said.

The internet domain seizure is part of a broader effort by Western law enforcement and intelligence agencies to sound the alarm about alleged Chinese government plots to recruit workers who can be duped into disclosing sensitive information.

Last week, for in...